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Theorem truantru 1289
Description: A identity. (Contributed by Anthony Hart, 22-Oct-2010.)
Assertion
Ref Expression
truantru (( ⊤ ⊤ ) ↔ ⊤ )

Proof of Theorem truantru
StepHypRef Expression
1 anidm 376 1 (( ⊤ ⊤ ) ↔ ⊤ )
Colors of variables: wff set class
Syntax hints:   wa 97  wb 98  wtru 1243
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 99  ax-ia2 100  ax-ia3 101
This theorem depends on definitions:  df-bi 110
This theorem is referenced by: (None)
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